What is the effect of plant growth regulators on crops?

What is the effect of plant growth regulators on crops? What is the effect of using plant growth regulators? Please also ask netizens to help introduce plant growth regulators, which refer to a class of pesticides used to regulate plant growth and development, including synthetic compounds and natural plant hormones extracted from organisms. The planting network has sorted out the six major functions of plant growth regulators, which are listed in detail below for netizens' reference. First, break the dormancy of plant seeds to promote germination: such as newly harvested seeds, immature seeds, seeds with poor environmental conditions at harvest and seeds with poor storage or long-term storage, the germination rate is low or unable to germinate, slow emergence or weak seedlings, thus affecting the emergence rate and increasing the amount of seeds used. The application of gibberellin and other seed management seeds can break dormancy, promote germination, increase seed germination rate, and make seedling emergence early and strong. The second function is to increase tillers and promote roots of crops and cultivate dwarf seedlings: for example, growth retarders help to overcome the influence of adverse environmental conditions, delay seedling growth and form dwarf seedlings. Paclobutrazol and dwarftin have a good effect on cultivating strong seedlings, and the main application methods are seed treatment and foliar spraying at seedling stage. Third, promote plant grain filling: for example, in production, the full grain filling of rice and wheat is often promoted by the application of auxin, gibberellin and cytokinin plant growth regulators. For example, spraying growth regulators such as fine fertilizer mitogen and Zengchanling at rice, wheat booting, flowering and filling stages can enhance the intensity of photosynthesis and the transfer rate of nutrients to reproductive organs, prolong the functional period of leaves, and accelerate the speed of grain filling. Increase 1000-grain weight and increase yield. Fourth, control the overgrowth of plants and prevent lodging: cereal crops such as wheat often lodge in the later stage, especially tall-stalked varieties. In high fertilizer and water areas, even dwarf varieties are still likely to lodge. The application of growth retarder can effectively control overgrowth, reduce height and prevent toppling, and increase yield. Fifth, prevent plants from falling flowers and fruits in order to promote fruiting: for example, the falling flowers and fruits of infinite inflorescence crops such as cotton, legumes and melons are not only related to environmental conditions and cultivation techniques, but also related to vegetative growth and reproductive growth, as well as hormone balance in the body. In production, auxins and growth retarders can be used to improve its growth status and hormone balance in the body, so as to prevent the shedding of flowers and fruits and increase the fruit setting rate. Sixth, promote the maturity of plants: for example, the endogenous hormone Fine Fertilizer can delay aging, while ethylene and abscisic acid can accelerate aging and promote maturity. The function and usage of paclobutrazol